A cell phone, mobile phone or simply cell, phone, can literally be a small portable phone that will make and receive calls on a low-frequency signal network while the user is traveling within a telephone service zone. Most cell phones come with a built-in AM/FM receiver that receives the signals and converts them to digital information that is sent to the earpiece of the cell phone. There are many cell phones that do not have an external AM/FM receiver as they use an infra red beam that beams the incoming signal into the earpiece. These cell phones can be a handy tool if a user needs to make or receive calls while they are traveling outdoors. There are some cell phones which are designed to only accept preloaded phone numbers. While there are some older mobile phones that do not have preloaded numbers, newer cell phones can accept any phone which has a memory chip and a receiver.
One of the most important components of a mobile phone is the battery. Cell phones work on batteries that are generally replaceable and they are generally powered through mains electricity. The life of a battery will be greatly affected by the way it is used and the amount of time it is left on. The type of battery that is used will also depend on the amount of time a person plans on using their cell phone. Some people will place their mobile phone inside a glove box in their car and only use it while away from home and for particular phone numbers, while others leave their mobile phones in their car all the time.
A variety of different cell phone networks are available. Most people own a mobile that uses either CDMA or GSM technology. CDMA phones use the same format as regular telephone networks, while GSM phones are able to communicate with several different networks. CDMA phones will only accept calls from other CDMA phones, and GSM phones can receive calls from other networks as well. These are the main types of mobile networks that most people use.